JPS5924025B2 - Device to prevent rolling of cargo boxes in dump trucks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing rolling of a cargo box in a dump truck, which is robust and has excellent durability.

Generally speaking, in a dump truck, the cargo box, which is tiltably placed on the chassis frame, is placed on the chassis frame to prevent it from swaying when driving.
The chassis frame is provided with a device to prevent the cargo box from rolling.

By the way, in the conventional device, as shown in FIG. 4, an angular anti-rolling member A' is welded to the sub-frame 03 on the upper part 2 of the main frame 2, and the overhanging part 012 of the member A' prevents the cargo box 05 from moving. In this case, a lateral swaying force was applied to the cargo box 05, and a load F was applied to the cantilevered lateral sway prevention member A'. At this time, a moment Fxt acts on the base of the roll prevention member A', that is, the welded part with the subframe 03, and a large concentrated stress is generated there. If such concentrated stress occurs repeatedly, the welded part It has the disadvantage that it cannot be resisted, and eventually cracks occur and the roll prevention function can no longer be achieved.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the conventional devices and to provide a device for preventing rolling of a cargo box in a dump truck that is robust and durable.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. Reference numeral 1 designates a chassis frame of a dump truck, which is constructed by fixing a subframe 3 to a main frame 2 on which wheels are suspended.

A receiver 4 is mounted on the subframe 3, and a cargo box 5 is mounted on the receiver 4, which is hingedly connected to the rear end of the subframe 3 so as to be tiltable.

The floor plate 6 of the cargo box 5 has two main girders 7 extending vertically from its lower surface, and a plurality of cross members 8 that intersect with the main girders 7.
reinforced by.

A roll prevention member A for preventing the cargo box 5 from rolling is welded to the outer surface of the subframe 3.

This member A is composed of a roll prevention main frame 9 and a reinforcing frame 10 welded to the main frame 9.

Describing these structures in detail below, the roll prevention main frame 9 includes a substantially vertical base 11 welded 9' to the outer surface of the subframe 3, and a substantially horizontal base 11 extending from above the base 11 to the subframe 3. A support surface 13 for supporting the cross member 8 of the packing box 5 is formed in a substantially angular shape with the overhang 12 extending outward.
is formed.

Furthermore, at the boundary corner between the base 11 and the overhang 12, there is an inclined guide surface 14 for guiding the main girder 7 to the correct position when the cargo box 5 is lowered, and a slanted guide surface 14 for guiding the main girder 7 to the correct position when the cargo box 5 is lowered. A stopper surface 15 for regulating the position in the direction is formed.

The reinforcing frame 10 is welded approximately horizontally to the intermediate portion of the main frame 9 for preventing rolls, and has a supported portion 16 formed at its base end that extends inward of the main frame 9 for preventing rolls. Clamping part 1
Reference numeral 6 indicates a cutout hole 17 formed by cutting out the middle part of the wood receiver 4.
The lower surface of the lower surface is welded or in contact with the upper surface of the sub-frame 3, and the lower surface of the main girder 7 of the cargo box 5 is placed on the upper surface of the sub-frame 3. The clamping portion 16 is clamped between the main girder 7 and the subframe 3.

Supporting surface 13 formed on the overhanging portion 12 of the main frame 9 for preventing rolling
A support tree 18 is mounted on the support tree 18, and the cross member 8 of the cargo box 5 is brought into contact with this support tree 18.

In addition, a small gap may be formed in advance between the support tree 18 and the cross member 8 when the cargo box 5 is in a normal state, so that they come into contact with each other when the cargo box 5 is horizontally swayed.

Next, to explain the operation of the embodiment of the present invention, when the dump truck is running, especially on a rough road, a rolling force acts on the cargo box 5, and as a result, as shown in FIG. 2, the rolling prevention main frame 9 A load F1 is applied to the tip of the reinforcing frame 10 via the cross member 8, and a load F2 is distributed to the supported portion 16 of the reinforcing frame 10 via the main girder 7.

Here, the distance from the welded part 9' of the main frame 9 to the sub-frame 3 to the point of application of the load F1 is 11, and the distance from the welded part 9' to the point of application of the load F2 is 11. 12, a counterclockwise moment F is applied to the upper end of the welded portion 9' on the outer surface of the subframe 3 in FIG.
□×11 acts and at the same time, clockwise moment F2
×12 acts on the upper end of the weld, and as a result, a counterclockwise moment F1×l□−F2×12 acts on the upper end of the weld, and this moment is far greater than the moment that acts on the weld of the conventional weld. It is obvious that it is small.

Therefore, excessive concentrated stress is not generated in the welded portion 9' of the main frame 9 for preventing rolling, and there is no risk of cracking in the welded portion 9' even if the loading box 5 is repeatedly shaken.

As described above, according to the present invention, the roll prevention member of a dump truck is constituted by a roll prevention main frame and a reinforcing frame welded to the roll prevention main frame, and the roll prevention member is formed on the outer side of the roll prevention main frame hash frame. The reinforcing frame has a base to be welded, and a projecting part integrally projecting outward from the base to the outside of the chassis frame to support a cargo box. Since the clamping part is provided, the rolling force acting on the cargo box is distributed to the left and right sides of the welded part of the rolling prevention member to the chassis frame, and the resulting moment is distributed between the left and right parts of the welded part. The stress can be applied in the opposite direction, and therefore the concentrated stress occurring in the welded portion can be reduced as much as possible, and cracks will not occur in the welded portion even if rolling force is applied repeatedly to the cargo box. It is possible to achieve a reliable roll prevention function over a long period of time.

It goes without saying that the present invention can also be applied to subframeless dump trucks.

[Brief explanation of drawings]

Figure 1 is a side view of a dump truck equipped with the device of the present invention;
The figures are an enlarged sectional view taken along line 1--2 in FIG. 1, FIG. 3 is a view taken in the direction of arrow 2 in FIG. 2, and FIG. 4 is a sectional view the same as FIG. 2 of the conventional device. A... Rolling prevention member, 1... Chassis frame, 5... Loading box, 9... Rolling prevention main frame, 10... ...Reinforcement frame, 11...
Base, 12... overhanging part, 16... held part.

Claims (1)

[Claims] 1. A roll prevention member is welded to one side of the chassis frame on which the tiltable cargo box is placed, and to this roll prevention member,
In the loading box rolling prevention device for a dump truck, which engages the loading box to prevent the loading box from rolling, the rolling prevention member includes a rolling prevention main frame and a rolling prevention member welded to the main frame. 9. The main frame for preventing rolling has a base welded to the outer surface of the chassis frame, and the main frame integrally extends from the base to the outer side of the chassis frame to support a cargo box. 1. A device for preventing rolling of a cargo box in a dump truck, wherein the reinforcing frame includes at least a clamped portion sandwiched between a chassis frame and the cargo box.